JPS61112499A - Ultrasonic ceramic microphone - Google Patents
Ultrasonic ceramic microphoneInfo
- Publication number
- JPS61112499A JPS61112499A JP23435884A JP23435884A JPS61112499A JP S61112499 A JPS61112499 A JP S61112499A JP 23435884 A JP23435884 A JP 23435884A JP 23435884 A JP23435884 A JP 23435884A JP S61112499 A JPS61112499 A JP S61112499A
- Authority
- JP
- Japan
- Prior art keywords
- cylindrical case
- piezo
- bottom face
- electric magnetic
- magnetic vibrator
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000000919 ceramic Substances 0.000 title claims description 21
- 229920002050 silicone resin Polymers 0.000 abstract description 5
- 125000006850 spacer group Chemical group 0.000 abstract description 5
- 229920005989 resin Polymers 0.000 abstract description 4
- 239000011347 resin Substances 0.000 abstract description 4
- 230000035945 sensitivity Effects 0.000 abstract description 3
- 230000000903 blocking effect Effects 0.000 abstract 1
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 abstract 1
- 238000007789 sealing Methods 0.000 abstract 1
- 239000000853 adhesive Substances 0.000 description 3
- 230000001070 adhesive effect Effects 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 210000001015 abdomen Anatomy 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 238000012805 post-processing Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K9/00—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers
- G10K9/12—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers electrically operated
- G10K9/122—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers electrically operated using piezoelectric driving means
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Multimedia (AREA)
- Transducers For Ultrasonic Waves (AREA)
- Piezo-Electric Transducers For Audible Bands (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明は、パーキングメータ、自動車後方検知装置、あ
るい距離計等として応用される。超音波の送信、受信を
行なう超音波セラミックマイクロホンに関するものであ
る。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention is applied to parking meters, automobile rear detection devices, distance meters, and the like. This invention relates to an ultrasonic ceramic microphone that transmits and receives ultrasonic waves.
従来例の構成とその問題点
従来のこの種の超音波セラミックマイクロホンについて
、第゛２図を用いて説明する。（１）は圧電磁器振動子
で、断面が台形状の底面部（２ａ）を有する筒状ケース
（２）の内底面に前記圧電磁器振動子（１）を貼り合せ
、底面部（２ａ）をバイモルフ振動子として構成されて
いる。（３）は共振リングで、前記筒状ケース（２）の
内面に固定されている。（４）は端子板で、弾性部材よ
りなるシリコン樹脂スペーサ（５）を共振リング（３）
に接して筒状ケース（２）内に挿入し、＊記シリコン樹
脂スペーサ（５）に圧着して前記端子板（４）が固定さ
れている。（６）は弾性接着剤で、端子板（４）と筒状
ケース（２）との間が密封されるように注入されている
。 （７ａ）（７ｂ）はリード線で、一端は端子板（４
）に植設された端子（８ａ）（８ｂ）に接続され、他端
は圧電磁器振動子（１）の電極面及び筒状ケース（２）
の導通面に接続されている。Structure of a conventional example and its problems A conventional ultrasonic ceramic microphone of this type will be explained with reference to FIG. 2. (1) is a piezoelectric ceramic vibrator, in which the piezoelectric ceramic vibrator (1) is bonded to the inner bottom surface of a cylindrical case (2) having a bottom surface portion (2a) with a trapezoidal cross section, and the bottom surface portion (2a) is It is configured as a bimorph oscillator. (3) is a resonance ring, which is fixed to the inner surface of the cylindrical case (2). (4) is a terminal plate, and a silicone resin spacer (5) made of an elastic member is connected to a resonance ring (3).
The terminal plate (4) is fixed by being inserted into the cylindrical case (2) in contact with and crimped to the silicone resin spacer (5) marked *. (6) is an elastic adhesive, which is injected to seal the space between the terminal plate (4) and the cylindrical case (2). (7a) and (7b) are lead wires, one end of which is the terminal plate (4
), and the other end is connected to the electrode surface of the piezoelectric ceramic vibrator (1) and the cylindrical case (2).
connected to the conductive surface of the
しかしながら、このような従来の構成によると。However, according to such a conventional configuration.
圧電磁器振動子（１）を、それより形状・質量の大きな
筒状ケース（２）に貼り合せているため、固有振動周波
数は、筒状ケース（２）の形状・寸法によってほとんど
決定される。したがって、筒状ケース（２）の厚み、外
径、角度により固有振動周波数はバラツキを生じる。こ
のため実使用条件にマツチングする周波数を取り出すた
めには１歩留りが悪くなり、生産性に問題があった。Since the piezoelectric ceramic vibrator (1) is bonded to the cylindrical case (2) which has a larger shape and mass than the piezoelectric ceramic vibrator (1), the natural vibration frequency is almost determined by the shape and dimensions of the cylindrical case (2). Therefore, the natural vibration frequency varies depending on the thickness, outer diameter, and angle of the cylindrical case (2). For this reason, in order to extract a frequency that matches the actual usage conditions, the yield rate deteriorates, posing a problem in productivity.
発明の目的
本発明は上記従来の欠点を解消するもので、固有振動周
波数のバラツキを小さくできるとともに、必要周波数に
設定できる超音波セラミックマイクロホンを提供するこ
とを目的とする。OBJECTS OF THE INVENTION The present invention solves the above-mentioned conventional drawbacks, and an object thereof is to provide an ultrasonic ceramic microphone that can reduce the variation in natural vibration frequency and can be set to a required frequency.
発明の構成
上記目的を達成するため１本発明の超音波セラミックマ
イクロホンは、外面に凹部が形成された断面台形状の底
面部を有する筒状ケースと、この筒状ケースの底面部内
面に貼付された圧電磁器振動子と、前記筒状ケースの開
口部を閉塞する閉塞部材とを備え、前記筒状ケースの底
面部と前記圧電磁器振動子とによりバイモルフ振動子を
構成したものである。Structure of the Invention In order to achieve the above objects, the ultrasonic ceramic microphone of the present invention includes a cylindrical case having a bottom portion having a trapezoidal cross section and a recessed portion formed on the outer surface, and a cylindrical case attached to the inner surface of the bottom portion of the cylindrical case. The piezoelectric ceramic vibrator includes a piezoelectric ceramic vibrator and a closing member that closes an opening of the cylindrical case, and a bimorph vibrator is configured by the bottom surface of the cylindrical case and the piezoelectric ceramic vibrator.
かかる構成によれば、筒状ケースの質量を調整出来るよ
うに底面部外面に凹部を設けたので、基本共振のみの単
一共振特性とすることができると同時に、凹部に樹脂や
金属等を挿入固着することにより、周波数のコントロー
ルができるため、著しく歩留りを向上できる。According to this configuration, since a recess is provided on the outer surface of the bottom part so that the mass of the cylindrical case can be adjusted, a single resonance characteristic of only the fundamental resonance can be achieved, and at the same time, resin, metal, etc. can be inserted into the recess. By fixing it, it is possible to control the frequency, so the yield can be significantly improved.
実施例の説明
以下、本発明の一実施例について１図面に基づいて説明
する。DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below based on one drawing.
第１図は本発明の一実施例における超音波セラミックマ
イクロホンの断面図で、第２図に示す構成要素と同一の
構成要素には同一の符号を付してその説明を省略する。FIG. 1 is a cross-sectional view of an ultrasonic ceramic microphone according to an embodiment of the present invention, and the same components as those shown in FIG. 2 are given the same reference numerals and their explanations will be omitted.
第１図において、 （２ｂ）は凹部、（９）は塗装面で
ある。In Fig. 1, (2b) is the recess, and (9) is the painted surface.
断面が台形状の底面部（２ａ）を有する筒状ケース（２
）の底面部（２ａ）内面に、圧電磁器振動子（１）が貼
り合わされ、バイモルフ振動子が構成されている。A cylindrical case (2a) having a bottom part (2a) with a trapezoidal cross section.
) A piezoelectric ceramic vibrator (1) is bonded to the inner surface of the bottom surface (2a) to constitute a bimorph vibrator.
底面部（２ａ）の外面には、円形あるいは角形の凹部（
２ｂ）が複数個形成されている。この凹部（２ｂ）は１
個でもよい。凹部（２ｂ）は、底面部（２ａ）の振動モ
ード節あるいは腹部近傍に形成されており、これにより
、振動部の表面積が拡大されると同時に、振動部の実質
的な振動径が大きくなるため、バイモルフ振動部の固有
振動周波数が、次式で示すように低くなる。The outer surface of the bottom part (2a) is provided with a circular or square recess (
A plurality of 2b) are formed. This recess (2b) is 1
It may be one piece. The recess (2b) is formed near the vibration mode node or abdomen of the bottom part (2a), which expands the surface area of the vibrating part and increases the substantial vibration diameter of the vibrating part. , the natural vibration frequency of the bimorph vibrating section becomes lower as shown by the following equation.
ｆ ｒｍ ：固有振動周波数
に：定数
ｔ：厚み
ｄ：振動部の径
Ｅ：ヤング率
ρ：密度
Ｓ：ポアソン比
前記凹部（２ｂ）に、金属又は樹脂を挿入固定すること
により、振動部の径、負荷質量が変わり１周波数が変化
する。したがって、凹部（２ｂ）の数と大きさとを設定
することにより、固有振動周波数をコントロール出来る
。共振体（３）は筒状ケース（２）内部に固定されてお
り、筒状ケース（２）の機械的強度の向上と、振動共振
とを行なうものである。ダンパー効果をもたせたシリコ
ン樹脂スペーサ（５）は、端子板（４）を筒状ケース（
２）の開孔端に固定する場合、振動干渉を防ぐように取
り付けられている６弾性接着剤（９）は、前記端子板（
４）の外周端と筒状ケース（２）の開孔端との間を密封
するものであり、端子板（４）と共に閉塞部材を構成し
ている。f rm: Natural vibration frequency: Constant t: Thickness d: Diameter of the vibrating part E: Young's modulus ρ: Density S: Poisson's ratio By inserting and fixing metal or resin into the recess (2b), the diameter of the vibrating part can be changed. , the load mass changes and the frequency changes. Therefore, by setting the number and size of the recesses (2b), the natural vibration frequency can be controlled. The resonator (3) is fixed inside the cylindrical case (2) and improves the mechanical strength of the cylindrical case (2) and provides vibration resonance. The silicone resin spacer (5) with damper effect connects the terminal plate (4) to the cylindrical case (
When fixing to the open end of the terminal board (2), the elastic adhesive (9) is attached to prevent vibration interference.
4) and the open end of the cylindrical case (2), and constitutes a closing member together with the terminal plate (4).
塗装面（９）はアルマイトあるいは焼付塗装により構成
されており、筒状ケース（２）の表面を覆って耐腐食対
策を行なっている。The painted surface (9) is made of alumite or baked paint, and covers the surface of the cylindrical case (2) to provide corrosion resistance.
発明の詳細
な説明したように本発明によれば、筒状ケースの底面部
外面に凹部を形成したので、振動部すなわち底面部の径
が実質的に広くなって、感度が高くなると同時に、固有
振動周波数が低くなる。DETAILED DESCRIPTION OF THE INVENTION As described in detail, according to the present invention, since the concave portion is formed on the outer surface of the bottom portion of the cylindrical case, the diameter of the vibrating portion, that is, the bottom portion, is substantially widened, and at the same time, the sensitivity is increased and the inherent Vibration frequency becomes lower.
したがって、筒状ケースの厚み及び外径を変えないで周
波数コントロールができると同時に、後加工で、凹部に
樹脂等を注入固着することにより、周波数コントロール
ができる。さらに、振動面の凹部によって、屈曲振動モ
ード系の機械抵抗が高くなり、機械振動系の共振Ｑｍ（
尖鋭度）が小さくなって、感度−周波数特性の帯域幅が
広くなるとともに、周波数特性が安定となり、バラツキ
も低下する。また筒状ケースの内部は、筒状ケースと閉
塞部材とにより完全密封されているので、屋外等の悪環
境での使用に耐え、高信頼性を有する。Therefore, the frequency can be controlled without changing the thickness and outer diameter of the cylindrical case, and at the same time, the frequency can be controlled by injecting and fixing a resin or the like into the recess in post-processing. Furthermore, the concave portion of the vibration surface increases the mechanical resistance of the bending vibration mode system, and the resonance Qm (
(sharpness) becomes smaller, the bandwidth of the sensitivity-frequency characteristic becomes wider, the frequency characteristic becomes more stable, and the variation decreases. Moreover, since the inside of the cylindrical case is completely sealed by the cylindrical case and the closing member, it can withstand use in harsh environments such as outdoors and has high reliability.
第１図は本発明の一実施例における超音波セラミックマ
イクロホンの断面図、第２図は従来の超音波セラミック
マイクロホンの断面図である。
（１）・・・圧電磁器振動子、（２）・・・筒状ケース
、 （２ａ）・・・底面部、（２ｂ）・・・凹部、（４
）・・・端子板、（６）・・・弾性接着剤
代理人 森 本 義 弘
第１図
第２図
ｚFIG. 1 is a sectional view of an ultrasonic ceramic microphone according to an embodiment of the present invention, and FIG. 2 is a sectional view of a conventional ultrasonic ceramic microphone. (1) Piezoelectric ceramic vibrator, (2) Cylindrical case, (2a) Bottom part, (2b) Recessed part, (4
)...Terminal board, (6)...Elastic adhesive agent Yoshihiro Morimoto Figure 1 Figure 2 z
Claims (1)
る筒状ケースと、この筒状ケースの底面部内面に貼付さ
れた圧電磁器振動子と、前記筒状ケースの開口部を閉塞
する閉塞部材とを備え、前記筒状ケースの底面部と前記
圧電磁器振動子とによりバイモルフ振動子を構成した超
音波セラミックマイクロホン。1. A cylindrical case having a bottom with a trapezoidal cross section and a recess formed on the outer surface, a piezoelectric ceramic vibrator affixed to the inner surface of the bottom of the cylindrical case, and an opening of the cylindrical case closed. An ultrasonic ceramic microphone comprising: a closing member, and a bimorph vibrator configured by the bottom portion of the cylindrical case and the piezoelectric ceramic vibrator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23435884A JPS61112499A (en) | 1984-11-06 | 1984-11-06 | Ultrasonic ceramic microphone |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23435884A JPS61112499A (en) | 1984-11-06 | 1984-11-06 | Ultrasonic ceramic microphone |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS61112499A true JPS61112499A (en) | 1986-05-30 |
Family
ID=16969750
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP23435884A Pending JPS61112499A (en) | 1984-11-06 | 1984-11-06 | Ultrasonic ceramic microphone |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61112499A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007029907A1 (en) * | 2005-09-07 | 2007-03-15 | Bse Co., Ltd | A condenser microphone and method of making the same |
| US7737609B2 (en) | 2006-10-20 | 2010-06-15 | Murata Manufacturing Co., Ltd. | Ultrasonic sensor |
-
1984
- 1984-11-06 JP JP23435884A patent/JPS61112499A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007029907A1 (en) * | 2005-09-07 | 2007-03-15 | Bse Co., Ltd | A condenser microphone and method of making the same |
| US7737609B2 (en) | 2006-10-20 | 2010-06-15 | Murata Manufacturing Co., Ltd. | Ultrasonic sensor |
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